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I'm running Ubuntu 10.04 LTS (Lucid Lynx) on my Lenovo Thinkpad T60. I randomly get screen flickerings on my screen. Once it happens, it doesn't go away (unless I reboot my computer). I would describe the flickering as horizontal color lines appearing throughout the screen where the text is difficult to read everywhere.

I ran the following to see what video card is installed:

$ lspci | grep VGA
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400

My question is: what's wrong and how do I fix it?

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Based on your description, sounds like Bug #541501 which is still open.

I have a similar problem on a Thinkpad T60 with ATI Radeon Mobility X1300. None of the workarounds suggested in the comments of the linked bug entry (modeset=0 and/or new_pll=0 parameters to the radeon module, a newer mainline kernel) seem to completely make the problem go away for me – however, some of them seem to help a bit though.

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+1 sounds exactly like my problem is. YouTube video seems to confirm it too. Thanks for link. – spong Aug 16 '10 at 1:54
up vote 1 down vote accepted

I'm now running Ubuntu 11.04 on my Thinkpad T60, and the screen flickering issue doesn't exist anymore.

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